Discussion Starter · #1 ·
In looking at some older threads it appears JD used 80-90w oil in early gearboxes and Corn Head Grease in later ones. My S/N 597521 does not have a oil plug on my gearbox cover so I thought it would have grease but it has oil. In addition to the cork gasket on the cover there was a light amount of a white sealant all the way around. I am not the original owner so not sure if sealant was used originally or not. Anyone know the approx. serial number that they switched to grease? If anyone with a serial number close to mine has pulled the gearbox cover what did you find - grease or oil? Without a filler plug to check the level I am inclined to clean and refill with grease but if it originally had oil I would stay with oil. I have Operator's manual M89078 but it doesn't have any information about servicing the gearbox. If anyone has a service manual that covers the gearbox I would greatly a copy of a couple pages.